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Bath Buddy. Model Testing - In addition to sketching, large and small models were built to test certain theories. When the design was in the final stages of development a functioning proto-type was built for testing. Again, Jessica and Tess were observed using the product. It appeared to be successful. Again, a link analysis was diagramed and superimposed over the previous drawing. It was rewarding to see how effective the product preformed in this situation. The bath time was shorter, more enjoyable and more productive.